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  #1  
Old 01-04-2018, 05:22 PM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 878
Default TESTING - 3 blade prop in RV-12 iS

Was at Van's yesterday - looking around, returning parts that I over-ordered, picking up new parts. Walked out to the hanger to look at what's new just as Scott returned from an iS demo flight. Beautiful airplane! Noticed that they are 'testing a three blade prop. Asked if it was a CATO prop and if it was ok to list that info here. Was told that it was likely (not sure) a CATO, that they were testing it, and that it was ok to post here. A beautiful prop. Hope that it works out ok. Took a photo but there is no way that I am able to post it here - sorry.
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  #2  
Old 01-04-2018, 05:55 PM
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Phantom30 Phantom30 is offline
 
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Location: Coeur d'Alene, ID/Casa Grande, AZ
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Quote:
Originally Posted by E. D. Eliot View Post
Was at Van's yesterday - looking around, returning parts that I over-ordered, picking up new parts. Walked out to the hanger to look at what's new just as Scott returned from an iS demo flight. Beautiful airplane! Noticed that they are 'testing a three blade prop. Asked if it was a CATO prop and if it was ok to list that info here. Was told that it was likely (not sure) a CATO, that they were testing it, and that it was ok to post here. A beautiful prop. Hope that it works out ok. Took a photo but there is no way that I am able to post it here - sorry.
Very interesting!!! Love to hear what Vanís thinks.
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Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
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Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2018 Dues Paid
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  #3  
Old 01-04-2018, 10:26 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by E. D. Eliot View Post
Was at Van's yesterday - looking around, returning parts that I over-ordered, picking up new parts. Walked out to the hanger to look at what's new just as Scott returned from an iS demo flight. Beautiful airplane! Noticed that they are 'testing a three blade prop. Asked if it was a CATO prop and if it was ok to list that info here. Was told that it was likely (not sure) a CATO, that they were testing it, and that it was ok to post here. A beautiful prop. Hope that it works out ok. Took a photo but there is no way that I am able to post it here - sorry.
It was nice meeting you yesterday Ed.
Sorry I had to run right away.... we were late getting to a meeting after returning from a test flight evaluating the propeller performance.

One correction.... the propeller being test is a Sensenich 3 blade ground adjustable. It is an updated version from the original design we tested early in the RV-12 development program and decided not to offer in the kit.

The decision on whether to offer this newer design as an option is still under evaluation.
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  #4  
Old 01-05-2018, 12:25 AM
E. D. Eliot E. D. Eliot is offline
 
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Location: San Pedro
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Default Link attached - I hope

Here's the photo link - I hope.


https://imgur.com/q5BNhUU
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  #5  
Old 01-05-2018, 07:10 PM
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Phantom30 Phantom30 is offline
 
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Originally Posted by E. D. Eliot View Post
Here's the photo link - I hope.


https://imgur.com/q5BNhUU
Love the look of that egg beater!
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Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2018 Dues Paid
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  #6  
Old 01-05-2018, 07:14 PM
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Phantom30 Phantom30 is offline
 
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Quote:
Originally Posted by rvbuilder2002 View Post
It was nice meeting you yesterday Ed.
Sorry I had to run right away.... we were late getting to a meeting after returning from a test flight evaluating the propeller performance.

One correction.... the propeller being test is a Sensenich 3 blade ground adjustable. It is an updated version from the original design we tested early in the RV-12 development program and decided not to offer in the kit.

The decision on whether to offer this newer design as an option is still under evaluation.
Scott..would love to hear what the test pilot thought relative in smoothness compared to 2 blade...whether Vanís decides to offer as option..
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Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2018 Dues Paid
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  #7  
Old 01-06-2018, 01:14 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Originally Posted by Phantom30 View Post
Scott..would love to hear what the test pilot thought relative in smoothness compared to 2 blade...whether Vanís decides to offer as option..
There is no noticeable difference in smoothness between the standard two blade and the three blade being tested as long as both have had the blade pitch set accurately and a dynamic balance has been done.

A few other comparisons...

The 3 blade is between 1-2 lbs lighter than the two blade.

It makes the lower cowl more difficult to remove and install (will require a longer nose gear leg slot if it is officially adopted)

It has zero indexing capability for the blade pitch so each blade must be 100% adjusted manually (not a big deal for those that want smooth running and do that anyway)

The prop can be removed from the engine with the blades still installed, so no repitching is necessary if removed for 500 hr gear box inspections, etc.

Comparisons in performance will have to wait.......
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  #8  
Old 03-07-2018, 12:43 PM
todehnal todehnal is offline
 
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 916
Default

Quote:
Originally Posted by rvbuilder2002 View Post
There is no noticeable difference in smoothness between the standard two blade and the three blade being tested as long as both have had the blade pitch set accurately and a dynamic balance has been done.

A few other comparisons...

The 3 blade is between 1-2 lbs lighter than the two blade.

It makes the lower cowl more difficult to remove and install (will require a longer nose gear leg slot if it is officially adopted)

It has zero indexing capability for the blade pitch so each blade must be 100% adjusted manually (not a big deal for those that want smooth running and do that anyway)

The prop can be removed from the engine with the blades still installed, so no repitching is necessary if removed for 500 hr gear box inspections, etc.

Comparisons in performance will have to wait.......
Found this posting from 2 months ago. Any additional info available on the testing process at Van's?
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  #9  
Old 03-07-2018, 02:06 PM
Burtonport Burtonport is offline
 
Join Date: Sep 2013
Location: Watertown, New York
Posts: 32
Default Prop for RV-12

Since Van’s likes the prop for the RV-12 to be at an exact pitch then why not commission a fixed pitch prop, either 2 or 3 blade, that will be pitched exactly as specified for an RV-12?
I wonder if Van’s has ever considered a fixed pitch prop for the RV-12? My guess is that sometime over the last 10 years they have. I would be interested in hearing the plus and minus for a fixed pitch prop for the RV-12.
Thanks.
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Last edited by Burtonport : 03-07-2018 at 02:09 PM.
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  #10  
Old 03-07-2018, 02:50 PM
rv9builder rv9builder is online now
 
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Location: Irvine, CA
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Default

Yes, Vanís considered a fixed-pitch prop during RV-12 development. If I remember correctly, they decided to go with an adjustable prop so builders can fine-tune the prop to their specifications. If your plane is based in high mountains, you might want your prop set up differently than a plane based at sea level.
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